On Wed, Dec 8, 2010 at 1:34 PM, john skaller
<skal...@users.sourceforge.net> wrote:
>
> Another approach is probably better: directories simply don't exist.
> All files live in the root, they just have structured names.
> This interpretation is the most consistent and easiest to work with.
>
> You'd so something like:
>
> copy fred/(.*\.flx) joe/\1
>
> which clearly descends into subdirectories of the src, or if that isn't
> wanted:
>
> copy fred/([^/]*\.flx) joe/\1
>
> because here the regex can't match a path name with a / in it.
>
> It's a bit messy because "." means "any character" and so you have to
> use "\." when you mean the "." character.
>
> I plan to implement this :)
Conceptually this is pretty simple, though may be pretty inefficient
to do it on top of python's regular expression library. The naive
approach is to just do a full treewalk and to a regex substitution. To
eliminate the treewalk you'd have to parse the regex to see which
files match the partial directory. For instance, if you wrote (in
python's regex extension):
copy_regex(r'(?:(foo/.*/bar)|(bar/.*\.baz))', r'dst/\1')
You could optimize it to just do a treewalk down foo/, and just match
everything in bar/, but I'm not sure how to support that.
zsh's zcp, however, may have the semantics you want. It lets you write
the example like:
zcp 'foo/(**)/bar' 'dst/$1'
zcp 'bar/(*).baz' 'dst/$1'
The nice thing is that their pattern matching is much simpler than a
regular expression, and I don't think it'd be that hard to modify
fnmatch to capture the subexpressions and return them.
Here's it's docs from the zsh man page.
zmv [ -finqQsvwW ] [ -C | -L | -M | -p program ] [ -o optstring
] srcpat dest
Move (usually, rename) files matching the pattern srcpat
to corresponding files hav-
ing names of the form given by dest, where srcpat
contains parentheses surrounding
patterns which will be replaced in turn by $1, $2, ...
in dest. For example,
zmv ’(*).lis’ ’$1.txt’
renames ‘foo.lis’ to ‘foo.txt’, ‘my.old.stuff.lis’ to
‘my.old.stuff.txt’, and so on.
The pattern is always treated as an EXTENDED_GLOB
pattern. Any file whose name is
not changed by the substitution is simply ignored.
Any error (a substitution
resulted in an empty string, two substitutions gave the
same result, the destination
was an existing regular file and -f was not given)
causes the entire function to
abort without doing anything.
Options:
-f Force overwriting of destination files. Not
currently passed down to the
mv/cp/ln command due to vagaries of
implementations (but you can use -o-f to
do that).
-i Interactive: show each line to be executed and
ask the user whether to exe-
cute it. ‘Y’ or ‘y’ will execute it, anything
else will skip it. Note that
you just need to type one character.
-n No execution: print what would happen, but don’t do it.
-q Turn bare glob qualifiers off: now assumed by
default, so this has no effect.
-Q Force bare glob qualifiers on. Don’t turn this
on unless you are actually
using glob qualifiers in a pattern.
-s Symbolic, passed down to ln; only works with -L.
-v Verbose: print each command as it’s being executed.
-w Pick out wildcard parts of the pattern, as
described above, and implicitly
add parentheses for referring to them.
-W Just like -w, with the addition of turning
wildcards in the replacement pat-
tern into sequential ${1} .. ${N} references.
-C
-L
-M Force cp, ln or mv, respectively, regardless of
the name of the function.
-p program
Call program instead of cp, ln or mv. Whatever
it does, it should at least
understand the form ‘program -- oldname newname’
where oldname and newname
are filenames generated by zmv.
-o optstring
The optstring is split into words and passed
down verbatim to the cp, ln or
mv command called to perform the work. It should
probably begin with a ‘-’.
Further examples:
zmv -v ’(* *)’ ’${1// /_}’
For any file in the current directory with at least
one space in the name, replace
every space by an underscore and display the commands executed.
For more complete examples and other implementation
details, see the zmv source
file, usually located in one of the directories
named in your fpath, or in Func-
tions/Misc/zmv in the zsh distribution.
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